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Configuring Multiple Spanning Tree on the Switch
Console> (enable) show spantree mst 1
Spanning tree mode
Instance
VLANs Mapped:
Designated Root
Designated Root Priority
Designated Root Cost
Designated Root Port
Bridge ID MAC ADDR
Bridge ID Priority
Port
------------------------ ------------- ---- --------- ---- --------------------
Console> (enable) show spantree mst 7/2
Edge Port:
Link Type:
Port Guard:
Boundary:
Hello:
Inst State
---- ------------- ---- --------- ---- -----------------------------------
Console> (enable) show spantree mst config
Current (NVRAM) MST Region Configuration:
Configuration Name: cisco
Instance VLANs
-------- --------------------------------------------------------------
=======================================================================
Console> (enable)
Configuring the MST Bridge ID Priority
You can set the bridge ID priority for an MST instance when the switch is in MST mode.
The bridge priority value is combined with the system ID extension (the ID of the MST instance) to
create the bridge ID priority. You can set 16 possible bridge priority values: 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440.
To configure the bridge ID priority for an MST instance, perform this task in privileged mode:
Task
Step 1
Configure the bridge ID priority for an
MST instance.
Step 2
Verify the bridge ID priority.
The example shows how to configure the bridge ID priority for an MST instance:
Console> (enable) set spantree priority 8192 mst 3
set spantree priority 8192 mst 3
MST instance 3 bridge ID priority set to 8195
(bridge priority: 8192 + sys ID extension: 3)
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
7-54
State
Yes, (Configured) Enable
P2P, (Configured) Auto
Default
No
2, (Local bridge hello: 2)
Role Cost
0 forwarding
DESG
0
1,11-20,51-4094
1
2-10
2
21-30
3
31-40
4
41-50
MST
1
2-10
00-00-00-00-00-00
0
(root priority: 0, sys ID ext: 0)
0
Remaining Hops 0
1/0
00-d0-00-4c-18-00
32769
(bridge priority: 32768, sys ID ext: 1)
Role Cost
Prio VLANs
20000
32 1
Command
set spantree priority bridge_priority mst [instance]
show spantree mst [instance | mod/port]
Chapter 7
Configuring Spanning Tree
Prio Type
5 instances
Revision: 1
OL-8978-04
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